In these two genera, the alleles that allow the synthesis of muscarine, have been completely lost, or silenced.

在这两个类属中，允许成毒等位基因已经完全丢失或静默。

Their work reveals that muscarine, another compound hallucinogenic to the mammalian brain, has been produced in the fruiting bodies of fungi for 60 million years.

他们研究发现了另一种对哺乳动大脑有致幻作用——毒，已经在真菌子实体中产生了 6000 万年。

Many species within this family have conserved the alleles required to synthesizing muscarine until the present day, with a smaller subset of living genera within this family to lose this trait.

这个家族中许多种直到现在都保留了成毒所需等位基因，家族中只有一小部分活类属失去了这种特性。